You're riding along in a wide outside lane. Maybe it has a bike lane stripe, maybe not. It doesn't matter. You're riding a few feet from the right edge of the road. Faster same direction traffic is light, but you are passed occasionally.
Up ahead, the outside lane narrows. Maybe it's due to construction. Maybe it's due to a left turn lane being added to the road. Maybe you're transitioning from a place where there is no onstreet parallel parking to where there is. Maybe the road simply narrows. It doesn't really matter. The point is, the outside lane (including BL if one is present) goes from being "wide enough to be safely shared side-by-side" to "too narrow to be safely shared". If there is a bike lane stripe, it disappears.
If you think about this general situation, and some of your regular routes, I suspect you will recognize that this happens fairly often. I bring it up because I rarely see cyclists do the "right thing" in these fairly common situations. What they seem to think and feel is that as long as they maintain their line of travel relative to the right edge of road, they continue to have the right-of-way to proceed. What they don't seem to recognize is that they are merging left relative to the left edge of the outside lane. Whether they are simply maintaining their path or merging is crucial to determining right-of-way relative to traffic that is in the process of passing them.
Forgetting bikes for a second, consider a road with multiple lanes in the given direction where the right lane ends. Say there is a car in the rightmost (outside) lane, and another beside and just behind him in the adjacent lane to the left. As they approach the point where the right lane ends and merges with the adjacent lane, who has the right-of-way? Who is required to yield to whom?
In both scenarios the person to the right should yield to the driver adjacent on the left who is in the process of overtaking. You can't just cut in front of him. You need to wait to let him pass before you move into his path, or you need to signal and negotiate for right of way to merge left into his path. But I almost never see cyclists even look back in these situations, much less yield and/or negotiate for right of way.
Can you think of any situations like this on your regular routes? How do you handle them?